1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* include/net/xdp.h 3 * 4 * Copyright (c) 2017 Jesper Dangaard Brouer, Red Hat Inc. 5 */ 6 #ifndef __LINUX_NET_XDP_H__ 7 #define __LINUX_NET_XDP_H__ 8 9 #include <linux/bitfield.h> 10 #include <linux/filter.h> 11 #include <linux/netdevice.h> 12 #include <linux/skbuff.h> /* skb_shared_info */ 13 14 #include <net/page_pool/types.h> 15 16 /** 17 * DOC: XDP RX-queue information 18 * 19 * The XDP RX-queue info (xdp_rxq_info) is associated with the driver 20 * level RX-ring queues. It is information that is specific to how 21 * the driver has configured a given RX-ring queue. 22 * 23 * Each xdp_buff frame received in the driver carries a (pointer) 24 * reference to this xdp_rxq_info structure. This provides the XDP 25 * data-path read-access to RX-info for both kernel and bpf-side 26 * (limited subset). 27 * 28 * For now, direct access is only safe while running in NAPI/softirq 29 * context. Contents are read-mostly and must not be updated during 30 * driver NAPI/softirq poll. 31 * 32 * The driver usage API is a register and unregister API. 33 * 34 * The struct is not directly tied to the XDP prog. A new XDP prog 35 * can be attached as long as it doesn't change the underlying 36 * RX-ring. If the RX-ring does change significantly, the NIC driver 37 * naturally needs to stop the RX-ring before purging and reallocating 38 * memory. In that process the driver MUST call unregister (which 39 * also applies for driver shutdown and unload). The register API is 40 * also mandatory during RX-ring setup. 41 */ 42 43 enum xdp_mem_type { 44 MEM_TYPE_PAGE_SHARED = 0, /* Split-page refcnt based model */ 45 MEM_TYPE_PAGE_ORDER0, /* Orig XDP full page model */ 46 MEM_TYPE_PAGE_POOL, 47 MEM_TYPE_XSK_BUFF_POOL, 48 MEM_TYPE_MAX, 49 }; 50 51 /* XDP flags for ndo_xdp_xmit */ 52 #define XDP_XMIT_FLUSH (1U << 0) /* doorbell signal consumer */ 53 #define XDP_XMIT_FLAGS_MASK XDP_XMIT_FLUSH 54 55 struct xdp_mem_info { 56 u32 type; /* enum xdp_mem_type, but known size type */ 57 u32 id; 58 }; 59 60 struct page_pool; 61 62 struct xdp_rxq_info { 63 struct net_device *dev; 64 u32 queue_index; 65 u32 reg_state; 66 struct xdp_mem_info mem; 67 u32 frag_size; 68 } ____cacheline_aligned; /* perf critical, avoid false-sharing */ 69 70 struct xdp_txq_info { 71 struct net_device *dev; 72 }; 73 74 enum xdp_buff_flags { 75 XDP_FLAGS_HAS_FRAGS = BIT(0), /* non-linear xdp buff */ 76 XDP_FLAGS_FRAGS_PF_MEMALLOC = BIT(1), /* xdp paged memory is under 77 * pressure 78 */ 79 /* frags have unreadable mem, this can't be true for real XDP packets, 80 * but drivers may use XDP helpers to construct Rx pkt state even when 81 * XDP program is not attached. 82 */ 83 XDP_FLAGS_FRAGS_UNREADABLE = BIT(2), 84 }; 85 86 struct xdp_buff { 87 void *data; 88 void *data_end; 89 void *data_meta; 90 void *data_hard_start; 91 struct xdp_rxq_info *rxq; 92 struct xdp_txq_info *txq; 93 94 union { 95 struct { 96 /* frame size to deduce data_hard_end/tailroom */ 97 u32 frame_sz; 98 /* supported values defined in xdp_buff_flags */ 99 u32 flags; 100 }; 101 102 #ifdef __LITTLE_ENDIAN 103 /* Used to micro-optimize xdp_init_buff(), don't use directly */ 104 u64 frame_sz_flags_init; 105 #endif 106 }; 107 }; 108 109 static __always_inline bool xdp_buff_has_frags(const struct xdp_buff *xdp) 110 { 111 return !!(xdp->flags & XDP_FLAGS_HAS_FRAGS); 112 } 113 114 static __always_inline void xdp_buff_set_frags_flag(struct xdp_buff *xdp) 115 { 116 xdp->flags |= XDP_FLAGS_HAS_FRAGS; 117 } 118 119 static __always_inline void xdp_buff_clear_frags_flag(struct xdp_buff *xdp) 120 { 121 xdp->flags &= ~XDP_FLAGS_HAS_FRAGS; 122 } 123 124 static __always_inline void xdp_buff_set_frag_pfmemalloc(struct xdp_buff *xdp) 125 { 126 xdp->flags |= XDP_FLAGS_FRAGS_PF_MEMALLOC; 127 } 128 129 static __always_inline void xdp_buff_set_frag_unreadable(struct xdp_buff *xdp) 130 { 131 xdp->flags |= XDP_FLAGS_FRAGS_UNREADABLE; 132 } 133 134 static __always_inline u32 xdp_buff_get_skb_flags(const struct xdp_buff *xdp) 135 { 136 return xdp->flags; 137 } 138 139 static __always_inline void 140 xdp_init_buff(struct xdp_buff *xdp, u32 frame_sz, struct xdp_rxq_info *rxq) 141 { 142 xdp->rxq = rxq; 143 144 #ifdef __LITTLE_ENDIAN 145 /* 146 * Force the compilers to initialize ::flags and assign ::frame_sz with 147 * one write on 64-bit LE architectures as they're often unable to do 148 * it themselves. 149 */ 150 xdp->frame_sz_flags_init = frame_sz; 151 #else 152 xdp->frame_sz = frame_sz; 153 xdp->flags = 0; 154 #endif 155 } 156 157 static __always_inline void 158 xdp_prepare_buff(struct xdp_buff *xdp, unsigned char *hard_start, 159 int headroom, int data_len, const bool meta_valid) 160 { 161 unsigned char *data = hard_start + headroom; 162 163 xdp->data_hard_start = hard_start; 164 xdp->data = data; 165 xdp->data_end = data + data_len; 166 xdp->data_meta = meta_valid ? data : data + 1; 167 } 168 169 /* Reserve memory area at end-of data area. 170 * 171 * This macro reserves tailroom in the XDP buffer by limiting the 172 * XDP/BPF data access to data_hard_end. Notice same area (and size) 173 * is used for XDP_PASS, when constructing the SKB via build_skb(). 174 */ 175 #define xdp_data_hard_end(xdp) \ 176 ((xdp)->data_hard_start + (xdp)->frame_sz - \ 177 SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) 178 179 static inline struct skb_shared_info * 180 xdp_get_shared_info_from_buff(const struct xdp_buff *xdp) 181 { 182 return (struct skb_shared_info *)xdp_data_hard_end(xdp); 183 } 184 185 static __always_inline unsigned int 186 xdp_get_buff_len(const struct xdp_buff *xdp) 187 { 188 unsigned int len = xdp->data_end - xdp->data; 189 const struct skb_shared_info *sinfo; 190 191 if (likely(!xdp_buff_has_frags(xdp))) 192 goto out; 193 194 sinfo = xdp_get_shared_info_from_buff(xdp); 195 len += sinfo->xdp_frags_size; 196 out: 197 return len; 198 } 199 200 void xdp_return_frag(netmem_ref netmem, const struct xdp_buff *xdp); 201 202 /** 203 * __xdp_buff_add_frag - attach frag to &xdp_buff 204 * @xdp: XDP buffer to attach the frag to 205 * @netmem: network memory containing the frag 206 * @offset: offset at which the frag starts 207 * @size: size of the frag 208 * @truesize: total memory size occupied by the frag 209 * @try_coalesce: whether to try coalescing the frags (not valid for XSk) 210 * 211 * Attach frag to the XDP buffer. If it currently has no frags attached, 212 * initialize the related fields, otherwise check that the frag number 213 * didn't reach the limit of ``MAX_SKB_FRAGS``. If possible, try coalescing 214 * the frag with the previous one. 215 * The function doesn't check/update the pfmemalloc bit. Please use the 216 * non-underscored wrapper in drivers. 217 * 218 * Return: true on success, false if there's no space for the frag in 219 * the shared info struct. 220 */ 221 static inline bool __xdp_buff_add_frag(struct xdp_buff *xdp, netmem_ref netmem, 222 u32 offset, u32 size, u32 truesize, 223 bool try_coalesce) 224 { 225 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); 226 skb_frag_t *prev; 227 u32 nr_frags; 228 229 if (!xdp_buff_has_frags(xdp)) { 230 xdp_buff_set_frags_flag(xdp); 231 232 nr_frags = 0; 233 sinfo->xdp_frags_size = 0; 234 sinfo->xdp_frags_truesize = 0; 235 236 goto fill; 237 } 238 239 nr_frags = sinfo->nr_frags; 240 prev = &sinfo->frags[nr_frags - 1]; 241 242 if (try_coalesce && netmem == skb_frag_netmem(prev) && 243 offset == skb_frag_off(prev) + skb_frag_size(prev)) { 244 skb_frag_size_add(prev, size); 245 /* Guaranteed to only decrement the refcount */ 246 xdp_return_frag(netmem, xdp); 247 } else if (unlikely(nr_frags == MAX_SKB_FRAGS)) { 248 return false; 249 } else { 250 fill: 251 __skb_fill_netmem_desc_noacc(sinfo, nr_frags++, netmem, 252 offset, size); 253 } 254 255 sinfo->nr_frags = nr_frags; 256 sinfo->xdp_frags_size += size; 257 sinfo->xdp_frags_truesize += truesize; 258 259 return true; 260 } 261 262 /** 263 * xdp_buff_add_frag - attach frag to &xdp_buff 264 * @xdp: XDP buffer to attach the frag to 265 * @netmem: network memory containing the frag 266 * @offset: offset at which the frag starts 267 * @size: size of the frag 268 * @truesize: total memory size occupied by the frag 269 * 270 * Version of __xdp_buff_add_frag() which takes care of the pfmemalloc bit. 271 * 272 * Return: true on success, false if there's no space for the frag in 273 * the shared info struct. 274 */ 275 static inline bool xdp_buff_add_frag(struct xdp_buff *xdp, netmem_ref netmem, 276 u32 offset, u32 size, u32 truesize) 277 { 278 if (!__xdp_buff_add_frag(xdp, netmem, offset, size, truesize, true)) 279 return false; 280 281 if (unlikely(netmem_is_pfmemalloc(netmem))) 282 xdp_buff_set_frag_pfmemalloc(xdp); 283 if (unlikely(netmem_is_net_iov(netmem))) 284 xdp_buff_set_frag_unreadable(xdp); 285 286 return true; 287 } 288 289 struct xdp_frame { 290 void *data; 291 u32 len; 292 u32 headroom; 293 u32 metasize; /* uses lower 8-bits */ 294 /* Lifetime of xdp_rxq_info is limited to NAPI/enqueue time, 295 * while mem_type is valid on remote CPU. 296 */ 297 enum xdp_mem_type mem_type:32; 298 struct net_device *dev_rx; /* used by cpumap */ 299 u32 frame_sz; 300 u32 flags; /* supported values defined in xdp_buff_flags */ 301 }; 302 303 static __always_inline bool xdp_frame_has_frags(const struct xdp_frame *frame) 304 { 305 return !!(frame->flags & XDP_FLAGS_HAS_FRAGS); 306 } 307 308 static __always_inline u32 309 xdp_frame_get_skb_flags(const struct xdp_frame *frame) 310 { 311 return frame->flags; 312 } 313 314 #define XDP_BULK_QUEUE_SIZE 16 315 struct xdp_frame_bulk { 316 int count; 317 netmem_ref q[XDP_BULK_QUEUE_SIZE]; 318 }; 319 320 static __always_inline void xdp_frame_bulk_init(struct xdp_frame_bulk *bq) 321 { 322 bq->count = 0; 323 } 324 325 static inline struct skb_shared_info * 326 xdp_get_shared_info_from_frame(const struct xdp_frame *frame) 327 { 328 void *data_hard_start = frame->data - frame->headroom - sizeof(*frame); 329 330 return (struct skb_shared_info *)(data_hard_start + frame->frame_sz - 331 SKB_DATA_ALIGN(sizeof(struct skb_shared_info))); 332 } 333 334 struct xdp_cpumap_stats { 335 unsigned int redirect; 336 unsigned int pass; 337 unsigned int drop; 338 }; 339 340 /* Clear kernel pointers in xdp_frame */ 341 static inline void xdp_scrub_frame(struct xdp_frame *frame) 342 { 343 frame->data = NULL; 344 frame->dev_rx = NULL; 345 } 346 347 static inline void 348 xdp_update_skb_frags_info(struct sk_buff *skb, u8 nr_frags, 349 unsigned int size, unsigned int truesize, 350 u32 xdp_flags) 351 { 352 struct skb_shared_info *sinfo = skb_shinfo(skb); 353 354 sinfo->nr_frags = nr_frags; 355 /* 356 * ``destructor_arg`` is unionized with ``xdp_frags_{,true}size``, 357 * reset it after that these fields aren't used anymore. 358 */ 359 sinfo->destructor_arg = NULL; 360 361 skb->len += size; 362 skb->data_len += size; 363 skb->truesize += truesize; 364 skb->pfmemalloc |= !!(xdp_flags & XDP_FLAGS_FRAGS_PF_MEMALLOC); 365 skb->unreadable |= !!(xdp_flags & XDP_FLAGS_FRAGS_UNREADABLE); 366 } 367 368 /* Avoids inlining WARN macro in fast-path */ 369 void xdp_warn(const char *msg, const char *func, const int line); 370 #define XDP_WARN(msg) xdp_warn(msg, __func__, __LINE__) 371 372 struct sk_buff *xdp_build_skb_from_buff(const struct xdp_buff *xdp); 373 struct sk_buff *xdp_build_skb_from_zc(struct xdp_buff *xdp); 374 struct xdp_frame *xdp_convert_zc_to_xdp_frame(struct xdp_buff *xdp); 375 struct sk_buff *__xdp_build_skb_from_frame(struct xdp_frame *xdpf, 376 struct sk_buff *skb, 377 struct net_device *dev); 378 struct sk_buff *xdp_build_skb_from_frame(struct xdp_frame *xdpf, 379 struct net_device *dev); 380 struct xdp_frame *xdpf_clone(struct xdp_frame *xdpf); 381 382 static inline 383 void xdp_convert_frame_to_buff(const struct xdp_frame *frame, 384 struct xdp_buff *xdp) 385 { 386 xdp->data_hard_start = frame->data - frame->headroom - sizeof(*frame); 387 xdp->data = frame->data; 388 xdp->data_end = frame->data + frame->len; 389 xdp->data_meta = frame->data - frame->metasize; 390 xdp->frame_sz = frame->frame_sz; 391 xdp->flags = frame->flags; 392 } 393 394 static inline 395 int xdp_update_frame_from_buff(const struct xdp_buff *xdp, 396 struct xdp_frame *xdp_frame) 397 { 398 int metasize, headroom; 399 400 /* Assure headroom is available for storing info */ 401 headroom = xdp->data - xdp->data_hard_start; 402 metasize = xdp->data - xdp->data_meta; 403 metasize = metasize > 0 ? metasize : 0; 404 if (unlikely((headroom - metasize) < sizeof(*xdp_frame))) 405 return -ENOSPC; 406 407 /* Catch if driver didn't reserve tailroom for skb_shared_info */ 408 if (unlikely(xdp->data_end > xdp_data_hard_end(xdp))) { 409 XDP_WARN("Driver BUG: missing reserved tailroom"); 410 return -ENOSPC; 411 } 412 413 xdp_frame->data = xdp->data; 414 xdp_frame->len = xdp->data_end - xdp->data; 415 xdp_frame->headroom = headroom - sizeof(*xdp_frame); 416 xdp_frame->metasize = metasize; 417 xdp_frame->frame_sz = xdp->frame_sz; 418 xdp_frame->flags = xdp->flags; 419 420 return 0; 421 } 422 423 /* Convert xdp_buff to xdp_frame */ 424 static inline 425 struct xdp_frame *xdp_convert_buff_to_frame(struct xdp_buff *xdp) 426 { 427 struct xdp_frame *xdp_frame; 428 429 if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL) 430 return xdp_convert_zc_to_xdp_frame(xdp); 431 432 /* Store info in top of packet */ 433 xdp_frame = xdp->data_hard_start; 434 if (unlikely(xdp_update_frame_from_buff(xdp, xdp_frame) < 0)) 435 return NULL; 436 437 /* rxq only valid until napi_schedule ends, convert to xdp_mem_type */ 438 xdp_frame->mem_type = xdp->rxq->mem.type; 439 440 return xdp_frame; 441 } 442 443 void __xdp_return(netmem_ref netmem, enum xdp_mem_type mem_type, 444 bool napi_direct, struct xdp_buff *xdp); 445 void xdp_return_frame(struct xdp_frame *xdpf); 446 void xdp_return_frame_rx_napi(struct xdp_frame *xdpf); 447 void xdp_return_buff(struct xdp_buff *xdp); 448 void xdp_return_frame_bulk(struct xdp_frame *xdpf, 449 struct xdp_frame_bulk *bq); 450 451 static inline void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq) 452 { 453 if (unlikely(!bq->count)) 454 return; 455 456 page_pool_put_netmem_bulk(bq->q, bq->count); 457 bq->count = 0; 458 } 459 460 static __always_inline unsigned int 461 xdp_get_frame_len(const struct xdp_frame *xdpf) 462 { 463 const struct skb_shared_info *sinfo; 464 unsigned int len = xdpf->len; 465 466 if (likely(!xdp_frame_has_frags(xdpf))) 467 goto out; 468 469 sinfo = xdp_get_shared_info_from_frame(xdpf); 470 len += sinfo->xdp_frags_size; 471 out: 472 return len; 473 } 474 475 int __xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq, 476 struct net_device *dev, u32 queue_index, 477 unsigned int napi_id, u32 frag_size); 478 static inline int 479 xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq, 480 struct net_device *dev, u32 queue_index, 481 unsigned int napi_id) 482 { 483 return __xdp_rxq_info_reg(xdp_rxq, dev, queue_index, napi_id, 0); 484 } 485 486 void xdp_rxq_info_unreg(struct xdp_rxq_info *xdp_rxq); 487 void xdp_rxq_info_unused(struct xdp_rxq_info *xdp_rxq); 488 bool xdp_rxq_info_is_reg(struct xdp_rxq_info *xdp_rxq); 489 int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq, 490 enum xdp_mem_type type, void *allocator); 491 void xdp_rxq_info_unreg_mem_model(struct xdp_rxq_info *xdp_rxq); 492 int xdp_reg_mem_model(struct xdp_mem_info *mem, 493 enum xdp_mem_type type, void *allocator); 494 void xdp_unreg_mem_model(struct xdp_mem_info *mem); 495 int xdp_reg_page_pool(struct page_pool *pool); 496 void xdp_unreg_page_pool(const struct page_pool *pool); 497 void xdp_rxq_info_attach_page_pool(struct xdp_rxq_info *xdp_rxq, 498 const struct page_pool *pool); 499 500 /** 501 * xdp_rxq_info_attach_mem_model - attach registered mem info to RxQ info 502 * @xdp_rxq: XDP RxQ info to attach the memory info to 503 * @mem: already registered memory info 504 * 505 * If the driver registers its memory providers manually, it must use this 506 * function instead of xdp_rxq_info_reg_mem_model(). 507 */ 508 static inline void 509 xdp_rxq_info_attach_mem_model(struct xdp_rxq_info *xdp_rxq, 510 const struct xdp_mem_info *mem) 511 { 512 xdp_rxq->mem = *mem; 513 } 514 515 /** 516 * xdp_rxq_info_detach_mem_model - detach registered mem info from RxQ info 517 * @xdp_rxq: XDP RxQ info to detach the memory info from 518 * 519 * If the driver registers its memory providers manually and then attaches it 520 * via xdp_rxq_info_attach_mem_model(), it must call this function before 521 * xdp_rxq_info_unreg(). 522 */ 523 static inline void xdp_rxq_info_detach_mem_model(struct xdp_rxq_info *xdp_rxq) 524 { 525 xdp_rxq->mem = (struct xdp_mem_info){ }; 526 } 527 528 /* Drivers not supporting XDP metadata can use this helper, which 529 * rejects any room expansion for metadata as a result. 530 */ 531 static __always_inline void 532 xdp_set_data_meta_invalid(struct xdp_buff *xdp) 533 { 534 xdp->data_meta = xdp->data + 1; 535 } 536 537 static __always_inline bool 538 xdp_data_meta_unsupported(const struct xdp_buff *xdp) 539 { 540 return unlikely(xdp->data_meta > xdp->data); 541 } 542 543 static inline bool xdp_metalen_invalid(unsigned long metalen) 544 { 545 unsigned long meta_max; 546 547 meta_max = type_max(typeof_member(struct skb_shared_info, meta_len)); 548 BUILD_BUG_ON(!__builtin_constant_p(meta_max)); 549 550 return !IS_ALIGNED(metalen, sizeof(u32)) || metalen > meta_max; 551 } 552 553 struct xdp_attachment_info { 554 struct bpf_prog *prog; 555 u32 flags; 556 }; 557 558 struct netdev_bpf; 559 void xdp_attachment_setup(struct xdp_attachment_info *info, 560 struct netdev_bpf *bpf); 561 562 #define DEV_MAP_BULK_SIZE XDP_BULK_QUEUE_SIZE 563 564 /* Define the relationship between xdp-rx-metadata kfunc and 565 * various other entities: 566 * - xdp_rx_metadata enum 567 * - netdev netlink enum (Documentation/netlink/specs/netdev.yaml) 568 * - kfunc name 569 * - xdp_metadata_ops field 570 */ 571 #define XDP_METADATA_KFUNC_xxx \ 572 XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_TIMESTAMP, \ 573 NETDEV_XDP_RX_METADATA_TIMESTAMP, \ 574 bpf_xdp_metadata_rx_timestamp, \ 575 xmo_rx_timestamp) \ 576 XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_HASH, \ 577 NETDEV_XDP_RX_METADATA_HASH, \ 578 bpf_xdp_metadata_rx_hash, \ 579 xmo_rx_hash) \ 580 XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_VLAN_TAG, \ 581 NETDEV_XDP_RX_METADATA_VLAN_TAG, \ 582 bpf_xdp_metadata_rx_vlan_tag, \ 583 xmo_rx_vlan_tag) \ 584 585 enum xdp_rx_metadata { 586 #define XDP_METADATA_KFUNC(name, _, __, ___) name, 587 XDP_METADATA_KFUNC_xxx 588 #undef XDP_METADATA_KFUNC 589 MAX_XDP_METADATA_KFUNC, 590 }; 591 592 enum xdp_rss_hash_type { 593 /* First part: Individual bits for L3/L4 types */ 594 XDP_RSS_L3_IPV4 = BIT(0), 595 XDP_RSS_L3_IPV6 = BIT(1), 596 597 /* The fixed (L3) IPv4 and IPv6 headers can both be followed by 598 * variable/dynamic headers, IPv4 called Options and IPv6 called 599 * Extension Headers. HW RSS type can contain this info. 600 */ 601 XDP_RSS_L3_DYNHDR = BIT(2), 602 603 /* When RSS hash covers L4 then drivers MUST set XDP_RSS_L4 bit in 604 * addition to the protocol specific bit. This ease interaction with 605 * SKBs and avoids reserving a fixed mask for future L4 protocol bits. 606 */ 607 XDP_RSS_L4 = BIT(3), /* L4 based hash, proto can be unknown */ 608 XDP_RSS_L4_TCP = BIT(4), 609 XDP_RSS_L4_UDP = BIT(5), 610 XDP_RSS_L4_SCTP = BIT(6), 611 XDP_RSS_L4_IPSEC = BIT(7), /* L4 based hash include IPSEC SPI */ 612 XDP_RSS_L4_ICMP = BIT(8), 613 614 /* Second part: RSS hash type combinations used for driver HW mapping */ 615 XDP_RSS_TYPE_NONE = 0, 616 XDP_RSS_TYPE_L2 = XDP_RSS_TYPE_NONE, 617 618 XDP_RSS_TYPE_L3_IPV4 = XDP_RSS_L3_IPV4, 619 XDP_RSS_TYPE_L3_IPV6 = XDP_RSS_L3_IPV6, 620 XDP_RSS_TYPE_L3_IPV4_OPT = XDP_RSS_L3_IPV4 | XDP_RSS_L3_DYNHDR, 621 XDP_RSS_TYPE_L3_IPV6_EX = XDP_RSS_L3_IPV6 | XDP_RSS_L3_DYNHDR, 622 623 XDP_RSS_TYPE_L4_ANY = XDP_RSS_L4, 624 XDP_RSS_TYPE_L4_IPV4_TCP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_TCP, 625 XDP_RSS_TYPE_L4_IPV4_UDP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_UDP, 626 XDP_RSS_TYPE_L4_IPV4_SCTP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_SCTP, 627 XDP_RSS_TYPE_L4_IPV4_IPSEC = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_IPSEC, 628 XDP_RSS_TYPE_L4_IPV4_ICMP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_ICMP, 629 630 XDP_RSS_TYPE_L4_IPV6_TCP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_TCP, 631 XDP_RSS_TYPE_L4_IPV6_UDP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_UDP, 632 XDP_RSS_TYPE_L4_IPV6_SCTP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_SCTP, 633 XDP_RSS_TYPE_L4_IPV6_IPSEC = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_IPSEC, 634 XDP_RSS_TYPE_L4_IPV6_ICMP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_ICMP, 635 636 XDP_RSS_TYPE_L4_IPV6_TCP_EX = XDP_RSS_TYPE_L4_IPV6_TCP | XDP_RSS_L3_DYNHDR, 637 XDP_RSS_TYPE_L4_IPV6_UDP_EX = XDP_RSS_TYPE_L4_IPV6_UDP | XDP_RSS_L3_DYNHDR, 638 XDP_RSS_TYPE_L4_IPV6_SCTP_EX = XDP_RSS_TYPE_L4_IPV6_SCTP | XDP_RSS_L3_DYNHDR, 639 }; 640 641 struct xdp_metadata_ops { 642 int (*xmo_rx_timestamp)(const struct xdp_md *ctx, u64 *timestamp); 643 int (*xmo_rx_hash)(const struct xdp_md *ctx, u32 *hash, 644 enum xdp_rss_hash_type *rss_type); 645 int (*xmo_rx_vlan_tag)(const struct xdp_md *ctx, __be16 *vlan_proto, 646 u16 *vlan_tci); 647 }; 648 649 #ifdef CONFIG_NET 650 u32 bpf_xdp_metadata_kfunc_id(int id); 651 bool bpf_dev_bound_kfunc_id(u32 btf_id); 652 void xdp_set_features_flag(struct net_device *dev, xdp_features_t val); 653 void xdp_set_features_flag_locked(struct net_device *dev, xdp_features_t val); 654 void xdp_features_set_redirect_target(struct net_device *dev, bool support_sg); 655 void xdp_features_set_redirect_target_locked(struct net_device *dev, 656 bool support_sg); 657 void xdp_features_clear_redirect_target(struct net_device *dev); 658 void xdp_features_clear_redirect_target_locked(struct net_device *dev); 659 #else 660 static inline u32 bpf_xdp_metadata_kfunc_id(int id) { return 0; } 661 static inline bool bpf_dev_bound_kfunc_id(u32 btf_id) { return false; } 662 663 static inline void 664 xdp_set_features_flag(struct net_device *dev, xdp_features_t val) 665 { 666 } 667 668 static inline void 669 xdp_features_set_redirect_target(struct net_device *dev, bool support_sg) 670 { 671 } 672 673 static inline void 674 xdp_features_clear_redirect_target(struct net_device *dev) 675 { 676 } 677 #endif 678 679 static inline void xdp_clear_features_flag(struct net_device *dev) 680 { 681 xdp_set_features_flag(dev, 0); 682 } 683 684 static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog, 685 struct xdp_buff *xdp) 686 { 687 /* Driver XDP hooks are invoked within a single NAPI poll cycle and thus 688 * under local_bh_disable(), which provides the needed RCU protection 689 * for accessing map entries. 690 */ 691 u32 act = __bpf_prog_run(prog, xdp, BPF_DISPATCHER_FUNC(xdp)); 692 693 if (static_branch_unlikely(&bpf_master_redirect_enabled_key)) { 694 if (act == XDP_TX && netif_is_bond_slave(xdp->rxq->dev)) 695 act = xdp_master_redirect(xdp); 696 } 697 698 return act; 699 } 700 #endif /* __LINUX_NET_XDP_H__ */ 701